{description: The cross-version extensions available in FHIR R4 from FHIR R4B, package_name: hl7.fhir.uv.xver, name: Hl7_fhir_uv_xver_r4b_r4, type: null, package_version: r4b.r4-0.0.1-snapshot-2, class: unknown, kind: null, url: 'http://hl7.org/fhir/4.3/ImplementationGuide/hl7.fhir.uv.xver-r4b.r4', version: 0.0.1-snapshot-2}